Add progressive web app companion for cross-platform access

Vite + TypeScript PWA that mirrors the Android app's core features:
- Pre-processed shelter data (build-time UTM33N→WGS84 conversion)
- Leaflet map with shelter markers, user location, and offline tiles
- Canvas compass arrow (ported from DirectionArrowView.kt)
- IndexedDB shelter cache with 7-day staleness check
- Service worker with CacheFirst tiles and precached app shell
- i18n for en, nb, nn (ported from Android strings.xml)
- iOS/Android compass handling with low-pass filter
- Respects user map interaction (no auto-snap on pan/zoom)
- Build revision cache-breaker for reliable SW updates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pwa/node_modules/@babel/plugin-bugfix-safari-class-field-initializer-scope/lib/index.js

@@ -0,0 +1,73 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+var helperPluginUtils = require('@babel/helper-plugin-utils');
+var core = require('@babel/core');
+
+function needsWrapping(node) {
+  if (core.types.isLiteral(node) && !core.types.isTemplateLiteral(node)) {
+    return false;
+  }
+  if (core.types.isCallExpression(node) || core.types.isOptionalCallExpression(node) || core.types.isNewExpression(node)) {
+    return needsWrapping(node.callee) || node.arguments.some(needsWrapping);
+  }
+  if (core.types.isTemplateLiteral(node)) {
+    return node.expressions.some(needsWrapping);
+  }
+  if (core.types.isTaggedTemplateExpression(node)) {
+    return needsWrapping(node.tag) || needsWrapping(node.quasi);
+  }
+  if (core.types.isArrayExpression(node)) {
+    return node.elements.some(needsWrapping);
+  }
+  if (core.types.isObjectExpression(node)) {
+    return node.properties.some(prop => {
+      if (core.types.isObjectProperty(prop)) {
+        return needsWrapping(prop.value) || prop.computed && needsWrapping(prop.key);
+      }
+      if (core.types.isObjectMethod(prop)) {
+        return false;
+      }
+      return false;
+    });
+  }
+  if (core.types.isMemberExpression(node) || core.types.isOptionalMemberExpression(node)) {
+    return needsWrapping(node.object) || node.computed && needsWrapping(node.property);
+  }
+  if (core.types.isFunctionExpression(node) || core.types.isArrowFunctionExpression(node) || core.types.isClassExpression(node)) {
+    return false;
+  }
+  if (core.types.isThisExpression(node)) {
+    return false;
+  }
+  if (core.types.isSequenceExpression(node)) {
+    return node.expressions.some(needsWrapping);
+  }
+  return true;
+}
+function wrapInitializer(path) {
+  const {
+    value
+  } = path.node;
+  if (value && needsWrapping(value)) {
+    path.node.value = core.types.callExpression(core.types.arrowFunctionExpression([], value), []);
+  }
+}
+var index = helperPluginUtils.declare(api => {
+  api.assertVersion("^7.16.0");
+  return {
+    name: "plugin-bugfix-safari-class-field-initializer-scope",
+    visitor: {
+      ClassProperty(path) {
+        wrapInitializer(path);
+      },
+      ClassPrivateProperty(path) {
+        wrapInitializer(path);
+      }
+    }
+  };
+});
+
+exports.default = index;
+//# sourceMappingURL=index.js.map